The Brunnen-G, all have hair like that and also that mark on their faces. You’ll see more of his race in Brigadoom. That episode basically tells the story of how the Brunnen-G became divided over standing up to the Divine Order. That was why they were destroyed in the opening of “His Shadow,,,”

Kai’s actually my favorite charater and holds the show and crew together.
(Saves them every week)

Remember the Time Prophet told Kai that he would lead the Humans, and defeat the Insect race.
That’s a substory that wraps up in the final episodes. Its pretty awesome. (Imo)